/* ========================================
   HEADER STYLES
   TSM Agency Design System v1.1
   Based on Client Documentation
   ======================================== */

/* ----------------------------------------
   Site Header
   Height: 80px → 64px on scroll
   Sticky with shadow only after scroll
   ---------------------------------------- */
header {
    padding-top: var(--space-1);
    background-color: var(--gray-400);
}
.site-header {
  position: sticky;
  top: 0;
  z-index: var(--z-header);
  width: 100%;
  max-width: 1200px;
  margin: var(--space-16) auto 0;
  padding: 0;
  border-radius: var(--radius-xl);
  transition: height var(--duration-normal) var(--ease-out),
              box-shadow var(--duration-normal) var(--ease-out),
              padding var(--duration-normal) var(--ease-out);
  height: var(--header-height);
}

/* Scrolled state - height changes and shadow appears */
.site-header.scrolled {
  height: var(--header-height-scrolled);
  box-shadow: var(--shadow-md);
  padding: 0 var(--space-16);
  top: var(--space-4);
}

.header-container {
  padding: var(--space-8) 0;
}

/* Header Inner Container */
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  gap: var(--space-48);
}

.header-bg {
  background: var(--surface-base);
  padding: var(--space-4);
  display: flex;
  align-items: center;
  gap: var(--space-32);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-md);
  flex: 1;
  height: 100%;
}

/* ----------------------------------------
   Logo
   ---------------------------------------- */
.site-logo {
  flex-shrink: 0;
  line-height: 0;
}

.site-logo a {
  display: inline-block;
  line-height: 0;
  transition: opacity var(--duration-fast) var(--ease-out);
}

.site-logo a:hover {
  opacity: 0.8;
}

.site-logo a:focus-visible {
  outline: 2px solid var(--border-focus);
  outline-offset: var(--space-4);
  border-radius: var(--radius-sm);
}

.site-logo .logo {
  height: 32px;
  width: auto;
  display: block;
  transition: height var(--duration-normal) var(--ease-out);
}

.site-header.scrolled .site-logo .logo {
  height: 28px;
}

/* ----------------------------------------
   Main Navigation
   ---------------------------------------- */
.main-nav {
  display: flex;
  align-items: center;
  gap: var(--space-32);
  flex: 1;
  justify-content: center;
}

.nav-link {
  font-family: var(--font-body);
  font-size: var(--fs-body);
  font-weight: var(--weight-medium);
  color: var(--text-primary);
  text-decoration: none;
  position: relative;
  transition: color var(--duration-fast) var(--ease-out);
  white-space: nowrap;
  display: flex;
  align-items: center;
  gap: var(--space-8);
}

.nav-link:hover {
  color: var(--color-brand-primary);
}

.nav-link:focus-visible {
  outline: 2px solid var(--border-focus);
  outline-offset: var(--space-4);
  border-radius: var(--radius-sm);
}

/* Active link indicator */
.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: calc(var(--space-8) * -1);
  left: 0;
  right: 0;
  height: 2px;
  background: var(--color-brand-primary);
}

/* ----------------------------------------
   Dropdown Menu
   ---------------------------------------- */
.nav-dropdown {
  position: relative;
}

.dropdown-toggle {
  cursor: pointer;
}

.dropdown-main-link {
  font-family: var(--font-body);
  font-size: var(--fs-body);
  font-weight: var(--weight-medium);
  color: var(--text-primary);
  text-decoration: none;
  transition: color var(--duration-fast) var(--ease-out);
}

.dropdown-main-link:hover {
  color: var(--color-brand-primary);
}

.dropdown-icon {
  transition: transform var(--duration-fast) var(--ease-out);
  margin-left: var(--space-4);
}

.nav-dropdown:hover .dropdown-icon {
  transform: rotate(180deg);
}

.dropdown-menu {
  position: absolute;
  top: calc(100% + var(--space-16));
  left: 50%;
  transform: translateX(-50%);
  background: var(--surface-base);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  padding: var(--space-8);
  min-width: 220px;
  opacity: 0;
  visibility: hidden;
  transition: all var(--duration-normal) var(--ease-out);
  z-index: var(--z-dropdown);
}

.nav-dropdown:hover .dropdown-menu {
  opacity: 1;
  visibility: visible;
  top: calc(100% + var(--space-8));
}

.dropdown-menu a {
  display: block;
  padding: var(--space-16);
  font-family: var(--font-body);
  font-size: var(--fs-body-sm);
  font-weight: var(--weight-medium);
  color: var(--text-primary);
  text-decoration: none;
  border-radius: var(--radius-sm);
  transition: all var(--duration-fast) var(--ease-out);
}

.dropdown-menu a:hover {
  background: var(--surface-hover);
  color: var(--color-brand-primary);
  transform: translateX(var(--space-4));
}

.dropdown-menu a:focus-visible {
  outline: 2px solid var(--border-focus);
  outline-offset: 2px;
}

/* ----------------------------------------
   Header Actions (Right Side)
   ---------------------------------------- */
.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-24);
  flex-shrink: 0;
}

.header-link {
  font-family: var(--font-body);
  font-size: var(--fs-body);
  font-weight: var(--weight-medium);
  color: var(--text-secondary);
  text-decoration: none;
  transition: color var(--duration-fast) var(--ease-out);
  white-space: nowrap;
}

.header-link:hover {
  color: var(--color-brand-primary);
}

.header-link:focus-visible {
  outline: 2px solid var(--border-focus);
  outline-offset: var(--space-4);
  border-radius: var(--radius-sm);
}

/* ----------------------------------------
   Primary Button (Phone)
   ---------------------------------------- */
.btn-primary,
.btn-phone {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--color-accent-default);
  color: var(--text-inverse);
  font-family: var(--font-headings);
  font-size: var(--fs-body);
  font-weight: var(--weight-semibold);
  padding: var(--space-8) var(--space-16);
  border-radius: 40px;
  text-decoration: none;
  transition: all var(--duration-fast) var(--ease-out);
  white-space: nowrap;
}

.btn-primary:hover,
.btn-phone:hover {
  background: var(--color-accent-dark);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.btn-primary:active,
.btn-phone:active {
  transform: translateY(0);
  box-shadow: var(--shadow-sm);
}

.btn-primary:focus-visible,
.btn-phone:focus-visible {
  outline: 2px solid var(--border-focus);
  outline-offset: var(--space-4);
}

/* ----------------------------------------
   Mobile Menu Toggle (Hidden on Desktop)
   ---------------------------------------- */
.mobile-menu-toggle {
  display: none;
  flex-direction: column;
  justify-content: space-between;
  width: 28px;
  height: 20px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
  z-index: calc(var(--z-mobile-overlay) + 1);
}

.hamburger-line {
  width: 100%;
  height: 3px;
  background: var(--text-primary);
  border-radius: var(--radius-sm);
  transition: all var(--duration-normal) var(--ease-out);
}

.mobile-menu-toggle[aria-expanded="true"] .hamburger-line:nth-child(1) {
  transform: translateY(8.5px) rotate(45deg);
}

.mobile-menu-toggle[aria-expanded="true"] .hamburger-line:nth-child(2) {
  opacity: 0;
}

.mobile-menu-toggle[aria-expanded="true"] .hamburger-line:nth-child(3) {
  transform: translateY(-8.5px) rotate(-45deg);
}

.mobile-menu-toggle:focus-visible {
  outline: 2px solid var(--border-focus);
  outline-offset: var(--space-4);
  border-radius: var(--radius-sm);
}

/* ----------------------------------------
   Mobile Navigation Overlay
   Full-screen overlay menu per client spec
   ---------------------------------------- */
.mobile-nav-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100vh;
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(4px);
  z-index: var(--z-mobile-overlay);
  opacity: 0;
  visibility: hidden;
  transition: all var(--duration-normal) var(--ease-out);
}

.mobile-nav-overlay.active {
  opacity: 1;
  visibility: visible;
}

.mobile-nav-content {
  position: absolute;
  top: 0;
  right: 0;
  width: 320px;
  max-width: 85vw;
  height: 100%;
  background: var(--surface-base);
  box-shadow: var(--shadow-xl);
  transform: translateX(100%);
  transition: transform var(--duration-normal) var(--ease-out);
  overflow-y: auto;
  padding: var(--space-96) var(--space-24) var(--space-24);
}

.mobile-nav-overlay.active .mobile-nav-content {
  transform: translateX(0);
}

.mobile-nav-close {
  position: absolute;
  top: var(--space-24);
  right: var(--space-24);
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-8);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background var(--duration-fast) var(--ease-out);
  border-radius: var(--radius-sm);
}

.mobile-nav-close:hover {
  background: var(--surface-hover);
}

.mobile-nav-close:focus-visible {
  outline: 2px solid var(--border-focus);
  outline-offset: 2px;
}

.mobile-nav-close svg {
  color: var(--text-primary);
}

/* ----------------------------------------
   Mobile Navigation Links
   ---------------------------------------- */
.mobile-nav {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.mobile-nav a {
  padding: var(--space-16);
  font-family: var(--font-body);
  font-size: var(--fs-body-lg);
  font-weight: var(--weight-medium);
  color: var(--text-primary);
  text-decoration: none;
  border-radius: var(--radius-md);
  transition: all var(--duration-fast) var(--ease-out);
}

.mobile-nav a:hover {
  background: var(--surface-hover);
  color: var(--color-brand-primary);
}

.mobile-nav a:focus-visible {
  outline: 2px solid var(--border-focus);
  outline-offset: 2px;
}

.mobile-nav-divider {
  height: 1px;
  background: var(--border-light);
  margin: var(--space-16) 0;
}

.mobile-phone {
  background: var(--color-brand-primary);
  color: var(--text-inverse) !important;
  font-weight: var(--weight-semibold);
  margin-top: var(--space-8);
}

.mobile-phone:hover {
  background: var(--color-brand-primary-dark);
}

/* Mobile Dropdown Styles */
.mobile-nav-dropdown {
  display: flex;
  flex-direction: column;
}

.mobile-dropdown-toggle {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-8);
}

.mobile-dropdown-link {
  flex: 1;
  padding: var(--space-16);
  font-family: var(--font-body);
  font-size: var(--fs-body-lg);
  font-weight: var(--weight-medium);
  color: var(--text-primary);
  text-decoration: none;
  border-radius: var(--radius-md);
  transition: all var(--duration-fast) var(--ease-out);
}

.mobile-dropdown-link:hover {
  background: var(--surface-hover);
  color: var(--color-brand-primary);
}

.mobile-dropdown-link:focus-visible {
  outline: 2px solid var(--border-focus);
  outline-offset: 2px;
}

.mobile-dropdown-icon-btn {
  background: none;
  border: none;
  padding: var(--space-16);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  transition: all var(--duration-fast) var(--ease-out);
}

.mobile-dropdown-icon-btn:hover {
  background: var(--surface-hover);
}

.mobile-dropdown-icon-btn:focus-visible {
  outline: 2px solid var(--border-focus);
  outline-offset: 2px;
}

.mobile-dropdown-icon {
  transition: transform var(--duration-normal) var(--ease-out);
  flex-shrink: 0;
}

.mobile-nav-dropdown.active .mobile-dropdown-icon {
  transform: rotate(180deg);
}

.mobile-dropdown-menu {
  display: none;
  flex-direction: column;
  padding-left: var(--space-16);
  gap: 0;
}

.mobile-nav-dropdown.active .mobile-dropdown-menu {
  display: flex;
}

.mobile-dropdown-menu a {
  padding: var(--space-16);
  font-family: var(--font-body);
  font-size: var(--fs-body);
  font-weight: var(--weight-normal);
  color: var(--text-secondary);
  text-decoration: none;
  border-radius: var(--radius-sm);
  transition: all var(--duration-fast) var(--ease-out);
}

.mobile-dropdown-menu a:hover {
  background: var(--surface-hover);
  color: var(--color-brand-primary);
  padding-left: var(--space-24);
}

/* ----------------------------------------
   Responsive Breakpoints
   ---------------------------------------- */

/* Tablet (≤1024px) */
@media (max-width: 1024px) {
  .site-header {
    width: 100%;
    margin: var(--space-8) var(--space-16) 0;
  }
  
  .header-inner {
    gap: var(--space-24);
  }
  
  .main-nav {
    gap: var(--space-24);
  }
  
  .header-actions {
    gap: var(--space-16);
  }
}

/* Mobile (≤768px) */
@media (max-width: 768px) {
  .site-header {
    width: calc(100% - var(--space-32));
    margin: var(--space-8) var(--space-16) 0;
    height: var(--header-height-scrolled);
  }
  
  .site-header.scrolled {
    height: var(--header-height-scrolled);
  }
  
  .header-inner {
    padding: 0 var(--space-16);
    gap: var(--space-16);
  }
  
  /* Hide desktop navigation */
  .main-nav,
  .header-actions {
    display: none;
  }
  
  /* Show mobile menu toggle */
  .mobile-menu-toggle {
    display: flex;
  }
  
  .site-logo .logo {
    height: 28px;
  }
  
  .site-header.scrolled .site-logo .logo {
    height: 24px;
  }
}

/* Small Mobile (≤480px) */
@media (max-width: 480px) {
  .mobile-nav-content {
    width: 100%;
    max-width: 100%;
  }
}

/* ----------------------------------------
   Accessibility & Focus States
   ---------------------------------------- */

/* Ensure all interactive elements have visible focus states */
button:focus-visible,
a:focus-visible {
  outline: 2px solid var(--border-focus);
  outline-offset: var(--space-4);
  border-radius: var(--radius-sm);
}

/* ----------------------------------------
   Reduced Motion Support
   Per client spec: disable transforms and opacity
   ---------------------------------------- */
@media (prefers-reduced-motion: reduce) {
  .site-header,
  .nav-link,
  .dropdown-menu,
  .dropdown-menu a,
  .btn-primary,
  .btn-phone,
  .mobile-menu-toggle,
  .hamburger-line,
  .mobile-nav-overlay,
  .mobile-nav-content,
  .mobile-nav a,
  .dropdown-icon,
  .mobile-dropdown-icon {
    transition: none !important;
    animation: none !important;
  }
  
  /* Keep visibility transitions for accessibility */
  .dropdown-menu {
    transition: opacity var(--duration-fast) var(--ease-out),
                visibility var(--duration-fast) var(--ease-out) !important;
  }
  
  /* Disable transforms */
  .btn-primary:hover,
  .btn-phone:hover,
  .dropdown-menu a:hover {
    transform: none !important;
  }
  
  .nav-dropdown:hover .dropdown-icon,
  .mobile-nav-dropdown.active .mobile-dropdown-icon {
    transform: none !important;
  }
}